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R31539 Cobalt vs. ASTM B617 Coin Silver

R31539 cobalt belongs to the cobalt alloys classification, while ASTM B617 coin silver belongs to the otherwise unclassified metals. There are 18 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.

For each property being compared, the top bar is R31539 cobalt and the bottom bar is ASTM B617 coin silver.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
75
Elongation at Break, % 13 to 22
1.1 to 22
Poisson's Ratio 0.29
0.37
Shear Modulus, GPa 86
28
Tensile Strength: Ultimate (UTS), MPa 1000 to 1340
290 to 520

Thermal Properties

Latent Heat of Fusion, J/g 320
120
Melting Completion (Liquidus), °C 1360
870
Melting Onset (Solidus), °C 1290
780
Specific Heat Capacity, J/kg-K 450
250
Thermal Expansion, µm/m-K 13
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
83
Electrical Conductivity: Equal Weight (Specific), % IACS 2.1
72

Otherwise Unclassified Properties

Density, g/cm3 8.4
10

Common Calculations

Stiffness to Weight: Axial, points 15
4.1
Stiffness to Weight: Bending, points 24
14
Strength to Weight: Axial, points 33 to 44
7.7 to 14
Strength to Weight: Bending, points 27 to 32
9.3 to 14
Thermal Shock Resistance, points 24 to 32
14 to 25

Alloy Composition

Aluminum (Al), % 0.3 to 1.0
0 to 0.0050
Cadmium (Cd), % 0
0 to 0.050
Carbon (C), % 0 to 0.14
0
Chromium (Cr), % 26 to 30
0
Cobalt (Co), % 57.7 to 68.7
0
Copper (Cu), % 0
9.0 to 10.4
Iron (Fe), % 0 to 0.75
0 to 0.050
Lanthanum (La), % 0.030 to 0.2
0
Lead (Pb), % 0
0 to 0.030
Manganese (Mn), % 0 to 1.0
0
Molybdenum (Mo), % 5.0 to 7.0
0
Nickel (Ni), % 0 to 1.0
0 to 0.010
Nitrogen (N), % 0 to 0.25
0
Phosphorus (P), % 0
0 to 0.020
Silicon (Si), % 0 to 1.0
0
Silver (Ag), % 0
89.6 to 91
Zinc (Zn), % 0
0 to 0.060
Residuals, % 0
0 to 0.060

Comparable Variants